Thread: LNK2019: unresolved external symbol 'symbol' referenced in function 'function'; fatal

Hi I made a simple C++ program and I'm getting errors and I don't know what I'm doing wrong. I'm new to C++ syntax so I can't figure out what mistake I made that is causing the stated linker errors. The generated error complains that my Test1::getNmNeighborhoodEntry() function does not exist so linking can't happen. I must be missing something obvious a more seasoned programmer can see. Here is sample code that generates this error:

ITest.h

Code:

#ifndef ITest_H
#define ITest_H

//#[ ignore
#ifdef _MSC_VER
// disable Microsoft compiler warning (debug information truncated)
#pragma warning(disable: 4786)
#endif
//#]

//## auto_generated
#include <string>
//## auto_generated
#include <algorithm>
//## auto_generated
//## link itsNmNeighborhoodEntry
class NmNeighborhoodEntry;
//## class ITest
class ITest {
//#[ ignore

    ////    Constructors and destructors    ////

public :

    //## auto_generated
    virtual ~ITest();

    ////    Relations and components    ////

protected :

    NmNeighborhoodEntry* itsNmNeighborhoodEntry;        //## link itsNmNeighborhoodEntry
};

#endif

ITest.cpp

Code:

//## auto_generated
#include "ITest.h"
//## link itsNmNeighborhoodEntry
#include "NmNeighborhoodEntry.h"

//## class ITest
ITest::~ITest() {
}

Test1.h

Code:

#ifndef Test1_H
#define Test1_H

//#[ ignore
#ifdef _MSC_VER
// disable Microsoft compiler warning (debug information truncated)
#pragma warning(disable: 4786)
#endif
//#]

//## auto_generated
#include <string>
//## auto_generated
#include <algorithm>
//## class Test1
#include "ITest.h"
//## auto_generated
class NmNeighborhoodEntry;

//## class Test1
class Test1 : public ITest {
//#[ ignore

    // Default Constructor is Private
    public:
       Test1();


    // Default Copy Constructor is Private
    private:
       Test1(const Test1& self);


    // Default Assignment Operator is Private
    private:
       Test1& operator=(const Test1& aTest1);
//#]

    ////    Constructors and destructors    ////

public :

    //## auto_generated
    ~Test1();

    NmNeighborhoodEntry* getNmNeighborhoodEntry();
};

#endif

Test1.cpp

Code:

//## auto_generated
#include "Test1.h"
//## auto_generated
#include "NmNeighborhoodEntry.h"

NmNeighborhoodEntry* itsNmNeighborhoodEntry;

//## class Test1
Test1::~Test1() {
}

Test1::Test1() {
}


NmNeighborhoodEntry* getNmNeighborhoodEntry() { 
    //return itsNmNeighborhoodEntry;
    return NULL;
}

NmNeighborhoodEntry.h

Code:

#ifndef NmNeighborhoodEntry_H
#define NmNeighborhoodEntry_H

//#[ ignore
#ifdef _MSC_VER
// disable Microsoft compiler warning (debug information truncated)
#pragma warning(disable: 4786)
#endif
//#]

//## auto_generated
#include <string>
//## auto_generated
#include <algorithm>

//## class NmNeighborhoodEntry

class NmNeighborhoodEntry {
//#[ ignore

    // Default Constructor is Private
    private:
       NmNeighborhoodEntry();


    // Default Copy Constructor is Private
    private:
       NmNeighborhoodEntry(const NmNeighborhoodEntry& self);


    // Default Assignment Operator is Private
    private:
       NmNeighborhoodEntry& operator=(const NmNeighborhoodEntry& aNmNeighborhoodEntry);
//#]

    ////    Constructors and destructors    ////

public :

    //## auto_generated
    ~NmNeighborhoodEntry();

    bool myIsPending;       //## attribute myIsPending

    unsigned short index;       //## attribute myNodeIndex
};

#endif

[

NmNeighborhoodEntry.cpp

Code:

//## auto_generated
#include "NmNeighborhoodEntry.h"

//## class NmNeighborhoodEntry
NmNeighborhoodEntry::~NmNeighborhoodEntry() {
}

driver.cpp

Code:

//#include "ITest.h"
#include "Test1.h"
//#include "Test2.h"
#include "NmNeighborhoodEntry.h"

Test1 *test1;
//Test2 *test2;
NmNeighborhoodEntry* myNmNeighborhoodEntry;

void main() {
    test1 = new Test1;
    //test2 = new Test2;

    //test1->itsNmNeighborhoodEntry = NULL;
    myNmNeighborhoodEntry = test1->getNmNeighborhoodEntry();

}

Originally Posted by bernt

In test1.cpp, you need to specify the scope of the get function, just like you did with the constructors:

Code:

NmNeighborhoodEntry* Test1::getNmNeighborhoodEntry() {
    //return itsNmNeighborhoodEntry;
    return NULL;
}

Thanks!